Abstract: A nuclear reactor fueling plan evaluating system and method in which reactor shutdown margin evaluation are performed quickly and accurately. A fueling procedure formulating part and an input setting part having databases are included. A maximum worth control rod candidate selecting part having a control rod worth calculating means which inputs fuel loading and control rod patterns of each fueling act, inputs a relatively simple second physics model, calculates control rod worth from the difference between the degree of subcriticality of a reactor core in a state that all control rods are inserted and the degree of subcriticality of the reactor core in a state that a single control rod is withdrawn for each fueling step, and selects a determined number of maximum worth control rod candidates. A reactor shutdown margin calculating part inputs a subdivided first physics model and calculates reactor shutdown margin for each maximum worth control rod candidate.

Abstract: An art of hydrogen concentration measurement in which the hydrogen concentration of any given location of an object to be measured can be nondestructively obtained is provided.

Abstract: Problem: To provide a refueling support system in which fuel transfer procedure establishing operations and associated operations precisely reflecting the fuel burnup conditions can be efficiently performed at the time of scheduled outages at a nuclear power plant.

Abstract: An art of hydrogen concentration measurement in which the hydrogen concentration of any given location of an object to be measured can be nondestructively obtained is provided.

Abstract: A spacer for a nuclear fuel assembly includes dividers orthogonally interdigitated relative to one another defining fuel and water rod cells. The dividers defining fuel rod cells have openings carrying an integrally formed spring which projects into the fuel cell to bear the fuel rod in the cell against an opposite stop carried by an opposing divider. The dividers are arranged in a 10×10 array with diagonally opposing quadrants being mirror images of one another. The dividers are surrounded by a peripheral band with integrally formed stops projecting into the peripheral cells enclosing the spacer.

Abstract: There are disclosed an inspection system for and a method of confirming the soundness of a transported object while the object is being transported and handled. Waveform sampling sensors are mounted on the transported object and a transportation container, and a GPS and a CCD camera are mounted on a transportation vehicle. Sampled data are sent via the Internet Web in real-time to a remote transported object monitoring office at all times while the object is being transported based on bidirectional communications between the transportation vehicle and the remote transported object monitoring office. Various items of information including generated accelerations, times at which the accelerations are generated, raw waveforms of the accelerations are successively displayed on a traveling route on a map displayed on a personal computer for bidirectional confirmation of the soundness of the transported object in real-time.

Abstract: A fuel assembly lower tie-plate with better performance in capturing linearly elongated foreign substances. The lower tie-plate has a screening plate positioned below the network section in the lower tie-plate cavity. The screening plate is arranged substantially horizontally so that the lower tie-plate cavity is divided into upper and lower parts by the screening plate. Tubular filters are attached to the screening plate so that the tubular filters have openings below and above the screening plate. Top ends of the tubular filters are closed, and the openings above the screening plate are formed in side walls of the tubular filters. The lower tie-plate may be assembled by combining the screening plate, the network section and the nozzle section together, after the tubular filters have been attached to the screening plate.

Abstract: Disclosed herein are zirconium-base alloys excellent in both corrosion resistance and hydrogen absorption property, useful as materials for nuclear reactors. Such a zirconium-base alloy for nuclear reactors comprises 0.5-2 wt. % Sn, 0.07-0.6 wt. % Fe, 0.03-0.2 wt. % Ni, 0.05-0.2 wt. % Cr, and the balance being zirconium and unavoidable impurities, wherein the Fe content (X wt. %) of the zirconium-base alloy and the mean size (Y nm) of precipitates in the zirconium-base alloy are present in a region on the x (Fe content X) and y (mean precipitate size) rectangular coordinates, surrounded by the following five lines: i) Y=−444×X+154, ii) Y=910×X−46, iii) Y=0, iv) Y=300, and v) X=0.6.